[OASIS Issue Tracker] (ODATA-1423) Check uniform handling of entities reached via navigation in responses

Gerald Krause created ODATA-1423:
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             Summary: Check uniform handling of entities reached via navigation in responses
                 Key: ODATA-1423
                 URL: https://issues.oasis-open.org/browse/ODATA-1423
             Project: OASIS Open Data Protocol (OData) TC
          Issue Type: Improvement
          Components: Data Aggregation
    Affects Versions: V4.0_CS02
            Reporter: Gerald Krause
             Fix For: V4.0_CSD04


When a transformation adds entities reached via navigation to its result, the request must specifically ask to expand them in order to have them appear in the response.

Example from ODATA-1409 that triggered the discussion: The join transformation in

{{GET ~/Products?$apply=join(Sales as Sale}}) creates a {{Sale}} dynamic property with Sales instances as values which are entities. Another {{$expand=Sale}} is required to include these entities in the response.

Cross-check this with other cases such that all behave in the same way:
 * transformation {{nest}} that can be used to add related entities to the input set
 * transformation {{groupby}} applied to single-valued navigation properties (see ODATA-971)
 * further?



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